Eraser tipped pencil



Aug. 3l, 1948. J. F. LINDEN 2,448,103

ERASER TIPPED PENCIL Filed Aug. 20, 1945 /w/ENTo/e, JHNI' fm/05NPatented Aug. 31, 1948 UNITED fsTATr-:s .PATENT oFFxcE 2,448.19? fERASERv TIPPD PENcn.

JohnrF. Linden, Toronto, ontario, canada Application August 20, 1945,serial No. G11-,57s

l The invention relates to improvements in eraser attachments forpencils of the ordinary i kind com rronlyf known as lead pencils, and

yfrom which the eraser projects.

The major object of the present invention is the provision of aone-piece eraser adapted to project from a ferrule and to completelysurround the side wall thereof so as to furnish a large and adequateeraser which will last as long as the pencil itself, and which is simplein con-,- struction and. inexpensive to manufacture.

Another object of the inventionis the provision Iof an efficient andserviceable method of firmly applying the eraser to the ferrule, and onethat can be carried out at low cost in the manufacture of the pencil.

Still another object is the provision of the novel arrangement of meansfor fasteningthe eraser element to the ferrule so that it will beeffectively secured thereto.

Having recounted the major objects andadvantages of the invention, otherobjects yand advantages will become apparent from'the ensuing detaileddescription of the invention as illustrated In `the accompanyingdrawingwhich forms a part thereof.

In the drawing, Fig. 1 is an elevational View partly in section of aneraser tipped pencil embodying my invention.

Fig. 2 is a cross section on line 2--2 of Fig. 1.

Fig. 3 is a similar view to Fig. 1 but showing the pencil as of acircular cross section and the eraser of a hexagonal configuration. l

Fig. 4 is a cross section on line 4--4 of Fig. 3.

Fig. .5 is a further elevational view partly in section of a.modication.

Fig. 6 is a view depicting the ferrule supplied with a different form offastening means for the eraser.

Fig. I is a view showing the eraser and pencil of Fig. 1 before theferrule is pressed into the eraser.

The eraser attachment of the invention is adapted to be applied to apencil of ordinary form. In the drawing there is shown a conventionaltype of pencil of which the wooden sheath is denoted 9 claims. (ci.12o-3e) at III. In proceeding in accordance with the invention there isprovided a cylindrical metal ferrule II securely mounted at its innerend to the outer end ,of the pencil sheath. Conventional means arepreferably used to attach the ferrule to the pencil. The inside diameterof the f errule is substantiallyequal to the cross section of thepencil, The projecting outer end I2 of the ferrule forms asocket.

The eraser element is a block of erasivematerial, generally denoted atyI3, which is made longer and wider than saidsocket portion .of theferrule. In the application of the eraser element to the 1outer endofthe ferrule it is fitted over thefsame to provide a distal end I'4 ofsolid materal and an inner end comprised of a central f tenon I5A whichfits into the socket I2, and an vouter part I6 which completelysurrounds the ysocket portion of the ferrule and is'axially coextensivewith said tenon. Consequently ythere is supplied .a thickness br band oferaser material kextending-entirely around the outerend of the ferrulewhose longitudinal extent is equal tothe portion of the eraser-materialprojecting into the socket. Since the cross-sectional area of the eraserelement is greater than that of the ferrule, there is provided anunbroken thickness of material around the ferrule which can beadvantageously used and which prolongs the life of the eraser.

The block of eraser material is applied to the pencil by pushing theopen end I2 of the ferrule into the material so that it will cut its waytherein and embed itself. The annular edge of said-outer' `end serves asa cutting edge in urging the ferrule into the eraser material and theycentral portion of the material which is annularly severed, enters thesocket I2 and seats itself against the adjacent end of the pencil in thelform of the central ltenon I5. 'Iihe material of the tenon is undercompressive stress vand the material around the `ferrule is underexpansive stress, which frictionally binds the eraser on the:requirements during the life of the pencil and is convenient of use.The eraser is of uniform angine 3 girth and the surface thereof isuninterrupted from one end to the other.

T-he eraser may be made of a circular or any other `configuration incross section. In Figs. 1 and 2 there is illustrated an eraser of thepresent disclosure having a circular girth. In Figs. 3 and 4 the eraseris of a hexagonal form. The novel method of attaching the eraser to theferrule isv advantageous in that the Wall of the socket 'gisfrictionally gripped 'internally and externally, by the rough surfacesof the cut made thereby, and it is obvious that these cooperatingsurfaces are specially adapted to adhere to any approved adhesivematerialfas maybe applied in any preferred manner to aid in securing thesocket portion of .the ferrle'to the eraser. The thusprovidedWdualContact' sul'- faces assure of a maximum of rigidity andresistance to longitudinal withdrawal of the leraser as well as guardingagainst its becoming fracturedforbroken in -f use.

vf'Io' further aid in the'securing ofthe eraser to pliediwi'th claws,lgrooves orv analogousy means.

v "For instancefin Fig.- 5 there -is depicted a claw- `*likeelement l ly'formed fini the'wall of 'the ysocket f'l2 lbyfmeans of laIprick-punch*tool after the Veraser"isapplied. 'For' purpose thepricktool can be driven through the outer "thickness 16 of 'the'eraser'material. fThehole-made inthe eraser I'by'fthef-pricktooliwillClose f on removal ofthe ftoolfduf-:l` -tol fthe' elasticity" of the'mat'eri-al. O-ne for "more in'dents Caniof vcourse be made' in" the lferrule to produce a-r` desired number "of fthe claws.

The Afastening means lon' thersocket' 312 may also Linclude' a" grooveas represented' atE I 8- J in Fig. 5. The' groove is? shown .as *af*peripheral 'indentation mayA extend partlyfor completely around theFig.' 6 1 a different' fform 'ofVVA groove 4is' "shown "f'whichfisf of aspiral formi and'ofia co'arsepitch.

This groove,which is denoted'at I9,Ipreferably has its 'ends tapered as'shown. The' spiral groove `4`is fashionedbyldeformingE the'socketwalland' thus provides a "ridgei interiorlly' 'th'ereof; which due 1 to'-the steep' pitch -freadilyepenetrates the *eraser lblock in forcing #theferrule Ytherein. `'When' the eraser ismountedionthe ferrule the ridgeoffers effective resistance "against axial displacement of the eraser.

1'It""willfbef manifest fthat 'my4v invention pro- "vides" a'f-highlyeicient and serviceable Yeraser'for a pencil and-that su'ch` changes andmodifications *of thesecuring means-on the :Eerr'ule maybe' re-`'lsa'idllouter Zend` 'of the l'ierrule vand to Jprovide IanMehdorn-passingband-like thicknessfof erasive :'Fmateri'al ex-tendingcompletely around said outer end and tightly ffiicti'onally tted"thereon, 'said block-being of greaterwidth-than' the' diameter of i 'i`said ferrule. i

25" An eraser lattaclmlent for; pencils comprisv'finganneraserelementf-of: a substantially hex- "agorlal fformation having: a''greaterflength than 'sive withsaid inner partand integral therewith atthe outer end of the'eraser element.

3. An eraser attachment `for pencils comprising an eraser element of ablock formation havlv'ing an-inner end, and a hollow cylindrical ferruleofy a substantially uniform diameter having yits outer end adapted toproject from the pencil, said` outer end thereof being press tted intosaid inner end of the eraser element to out its way'therein and toprovide an inner central portion of erasive material tightlyiriotionally en- -fl'gaged-with-'Vthe interior surface of said outer end'fandto providean outer uninterrupted portion 'of` erasive materialextending completely around `'said outer end-and tightly frictionallyengaged l With `the louter surface thereof.

l 4. An eraser attachment as set forth in claim l, in which the ferrulefis `provided with positive fffasteningimeans for `securing the'blockthereon. 15.1' `An 'eraser attachmentas set forth in claim'l,

gofinfwhich the `ferrule is deformed to form ythereonprojecting elementsfor securing the block i' f thereon.

6. An eraser attachment as set forth in claim 1, vnii-which"theferruleis prick punched subsequent a'tothemountingof the block oferasive material soj-y as 'toprov'ide claws' for'f positively retainingIkfthe? block lthereon.

f 7. 4An erasiveattachment as dei-ined in claim 3, iri'which theouterendof lthe :ferrule isf supplied llo with? aLl-spiral. groove ofia coarsepitch for 'aiding in fret'aining the' eraser element thereon.

BHAnMeraserattachment for pencils compris-- -Ying-aiiblo'ck'oferasive'mat'erial, and a ferrule adapted'to Abe secured on one end of apencil,

the outer end of the fer-rule yadapted to project *beyond* theend of thepencil being implanted in said'blockin a mannerto provide a centraltenori xfof: Eerasive `material .tightlyZ frictionally tted in saidouter end of the" ferrule and-toprovide an 'encompassing'band-likethickness of erasive ma- "of erasive material 'tightly frictionallyfitted' in`65 "terialfext'ending completely around said outer Tendancltightly frictionally tted thereon, said block`terminating.at itsouter eend with a section ."of"solidand-uncutmaterial integrallyprojecting beyond the outer end of the Feirule, and said "'blockbeing ofgreater width'than thefdiameter foi-the ferrule.. f

9. An eraser attachmentffor'fpencils comprising v.lander-aser'element ofa block formation having a *section constituting an iouter `end `ofsolid and ldiner-t"material'integrally with a section constituting aninner-vend'carried byA an axially holf'low'cylindrical' ferrule havingits outer end adapt- .v-'ed'to'project from the'pencil,v said outer endof the ferrule being pressilittedin said Vinner enderft-heeraserfelement. to provide an inner` cen- --tral yportion oferaser material-'tightly frictionally engaged with the inner face ofsaid outer vend 'Ilot the ferrule and f to provide van outeruninterrupted portion :ofl eraseiw-materialf completely surrounding saidouter end of the ferrule and vtightly lfrictionally engagedf with theouter ,face ft'hereof. i

f vJOHN F. LINDEN.`

